<!DOCTYPE html>
<html>
	<head>
		<meta charset="UTF-8">
		<title></title>
	</head>
	<body>
		<div id="div1" style="width: 200px;background: red;height: 200px;"></div>
		<script type="text/javascript">
			var div1=document.getElementById('div1');
			function getsum(){
				console.log(arguments.length);
				console.log(arguments)
			
			var sum=0;
			for (var i in arguments) {
				sum+=arguments[i];
				
			}
			return sum;
			}
			window.onload=function(){
				
				alert(css(div1,'width'));
				css(div1,'background','green');
			}
			function css(){
				if(arguments.length==2){
					arguments[0].style[arguments[1]]
				}else if(arguments.length==3){
					arguments[0].style[arguments[1]]=arguments[2];
				}else{
					alert("no")
				}
			
			}
		
		</script>
	</body>
</html>
